verification of osd_scrub_load_threshold with high CPU load using stress-ng

[SrinivasaBharath]

Description

The Fix includes the -

1. Automation to verify the osd_scrub_load_threshold with high CPU load using stress-ng.
   a. Install stress-ng package on all rados nodes
   b. Start stress-ng to continuously generate load
   c. Monitoring load continuously to verify it increases and calculate load threshold.The formula used to calculate the load is-
   Load_threshold = load_avgerage / online_cpu_count
   Where
   Load average is clculated by executing the "/proc/loadavg" command
   online_cpu_count is found by executing the nproc command
   d. Wait for load threshold (loadavg / online CPUs) to exceed 15
   e. Set the osd_scrub_load_threshold to 10(Default)
   f. Set the debug_osd and debug_mon to 20
   g. Start the user initiated scrub and check that the scrub should not get start if the load is high
   h. Check logs for scrub_load_below_threshold messages

2. Divided the scenarios in to separate tests

3. Uncommented the Verification of the osd_scrub_load_threshold parameter with the default value which is 10.0

Abandoning the following PR due to history issues and I re-open this new PR.All the review commnets can see at the below PR.
PR - #5549

Please include Automation development guidelines. Source of Test case - New Feature/Regression Test/Close loop of customer BZs

click to expand checklist

• Create a test case in Polarion reviewed and approved.
• Create a design/automation approach doc. Optional for tests with similar tests already automated.
• Review the automation design
• Implement the test script and perform test runs
• Submit PR for code review and approve
• Update Polarion Test with Automation script details and update automation fields
• If automation is part of Close loop, update BZ flag qe-test_coverage “+” and link Polarion test

[openshift-ci]

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This pull-request has been approved by: SrinivasaBharath
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